Publish Your Bot
The publish dialog shows all of the channels that are available for publishing and highlights them with different colors:
If you wish to take offline your chatbot on one or more channel all you need to do is to open the publish dialog and, for each channel you wish to take offline, click on the "Enabled" checkbox you can see on the top right corner.
If all channels are disabled your chatbot will go completely offline and stop accepting any kind of interaction on any channel.
After disabling the channel remember to save and publish your chatbot to confirm all changes. If you do not confirm your changes using the publish button no changes will be made to your live chatbot.